50results about How to "Good strength retention" patented technology

The present invention relates to a bioabsorbable and bioactive composite material for surgical musculoskeletal applications comprising a bioabsorbable polymeric matrix material which is reinforced with bioabsorbable polymeric fibers and bioabsorbable ceramic fibers. The surgical bioabsorbable polymeric matrix material is reinforced with the bioabsorbable polymeric fibers and the bioabsorbable ceramic fibers from which at least a portion is longer than 150 μm. The invention also relates to a method for manufacturing a bioabsorbable and bioactive composite material.

Bi-component polysulfide sealant and a preparation method thereof relate to a high-polymer sealing material and a preparation method thereof and aim to solve the problems of high density and poor heatproof degradation performance of existing sealant after being sulfurized. A component includes liquid polysulfide rubber, epoxy resin, thixotropic agent, reinforcing filler, hollow glass microballs, titanium dioxide, silane coupler and antiager, B component includes manganese dioxide, plasticizer, talcum powder and melaniline. The preparation method includes: the A component is prepared by addingthe thixotropic agent, the titanium dioxide, the reinforcing filler and the antiager to grind after the liquid polysulfide rubber and the epoxy resin are pre-polymerized and then adding treated hollow glass microballs to grind; the B component is prepared by mixing and grinding the manganese dioxide, the plasticizer and the talcum powder and then adding the melaniline to grind. The bi-component polysulfide sealant with the density smaller than or equal to 1.3g/cm3 is not crispy and not viscous in flowing after thermal ageing at the temperature of 180 DEG C for 10 hours. The preparation methodis applicable to preparation of polysulfide sealant.

The invention relates to a process for producing spunlaced composite high-performance polyphenylene sulfide fiber filtering material, belongs to the fibrous raw material textile production technology field. The process uses polyphenylene sulfide fiber as raw material, has the following steps: processing raw material by checking, weighing, feeding, feeding into long certain, mixing cotton and fine loosing; layering and carding respectively by a first carding machine and a second carding machine; putting respectively into mesh placing machine for placing mesh; debatching, congruent, superposing and prewetting; spunlacing by a plurality of spunlacing machine, dewatering, drying and reeling. The advantages of the invention is that: the invention adopts polyphenylene sulfide high-performance fiber as raw material, the raw material is adapted to high efficient high speed carding production for its self physical and chemical properties, structure and adaptability to meshing and reinforcing process; improves spunlacing entanglement effect to fiber; improves the mechanical strength of spunlaced composite filtering material significantly, and ensures the end product to achieve excellent mechanical properties, filtering quality and chemical resistance property.

The invention belongs to the technical field of impregnating compounds, and discloses a glass fiber impregnating compound and a preparation method and application thereof. The impregnating compound comprises a film-forming agent, a coupling agent, a lubricant, a wetting agent and a pH regulator, wherein the film-forming agent comprises two bisphenol A type epoxy resin emulsions with different epoxy equivalents. Compared with usage of an epoxy resin emulsion with a single epoxy equivalent as a film-forming agent, the film-forming agent disclosed by the invention has the advantages that the film-forming agent can ensure sufficient coating force of the epoxy resin emulsions on the surfaces of yarns and allow the yarns to have better softness; even if the yarns are stored for a long time, theyarns still have low stiffness, which is beneficial for subsequent processing and mechanical strength of a composite material; and meanwhile, the yarns have better damp-heat resistance and still havea good strength retention rate in a high-temperature and high-humidity environment due to matched use of the film-forming agent and the coupling agent.

The invention discloses a special high-performance additive for underwater masonry mortar. The special high-performance additive is composed of, by weight, 2-5 parts of a thickening agent, 0.5-1 part of super plasticizer, 5-8 parts of a thixotropic agent, 5-8 parts of special cement, 12-15 parts of a set controlling agent and 5-8 parts of an early strength agent. In the special high-performance additive for the underwater masonry mortar, the thickening agent can improve the adhesiveness of a mixed product, and therefore the underwater non-disperse mortar is endowed with the properties of dispersing and separating resistance. The super plasticizer can improve the fluidity and workability of the mixed product, and therefore the material is endowed with good self-leveling and self-compacting properties. The frequently-used super plasticizer mainly includes sulfonated resin or sulfonate, and therefore the material has the properties of underwater dispersing and separating resistance. Through the combined action of the doped special cement and the set controlling agent, the material is endowed with early strength and rapid hardening.

The invention provides a hydrated alumina molded matter, and a preparation method and an application thereof. The hydrated alumina molded matter is prepared by molding raw materials comprising at least one hydrated alumina, at least one Y molecular sieve and at least one cellulose ether. The water absorption rate of the hydrated alumina molded matter is 0.4-1.5, the delta value is 10% or less, and the Q1 is 12 N/mm or more. The invention also provides an alumina molded matter and an application thereof, wherein the alumina molded matter is prepared by calcination of the hydrated alumina molded matter. The molded matters provided by the invention have high strength and good strength retention rate. According to the method of the invention, a peptizing agent is not used during the molding process.

The invention discloses masonry mortar used in an underwater alkaline environment. The masonry mortar comprises the following components, according to a weight ratio, 180-220 parts by weight of Portland cement, 30-50 parts by weight of special cement, 705-715 parts by weight of natural medium sand, 13-18 parts by weight of resin glue powder, and 30-40 parts by weight of a special additive. The special additive is mixed from 2-5 parts by weight of a thickening agent, 0.5-1 part by weight of a super-plasticizer, 5-8 parts by weight of a thixotropic agent, 12-15 parts by weight of an adjusting admixture, and 5-8 parts by weight of an early strength agent. The masonry mortar is adjusted by high-performance additives special for underwater masonry mortar, and resin materials good in alkaline resistance are added, so that the masonry mortar is prevented from undergoing a reaction in the alkaline condition, and hardening and mortar performance aren't affected. At last, the masonry mortar is not prone to disperse, good in construction, resistant to alkaline, normal in underwater hardening, and high in strength in a working condition with water.

The invention discloses masonry mortar for an underwater acid environment. The masonry mortar comprises, by weight, 180-220 parts of common cement, 30-50 parts of special cement, 695-705 parts of natural medium sand, 20-30 parts of resin adhesive powder and 30-40 parts of special additives, wherein the special additives are mixed by, by weight, 2-5 parts of thickening agent, 0.5-1 part of super plasticizer, 5-8 parts of thixotropic agent, 12-15 parts of thickening time control agent and 5-8 parts of early strength agent. The masonry mortar has the advantages that by regulating the additives special for high-performance underwater masonry mortar and adding resin materials good in acid resistance, masonry mortar components are prevented from have reaction under acid conditions, the hardening and performance of the mortar cannot be affected, and the masonry mortar is less prone to dispersing, good in constructability, resistant to acid, capable of being normally hardened under water and high in strength under water operation conditions.

The invention discloses an alkali-free concrete accelerator and a processing method thereof. The alkali-free concrete accelerator comprises the following raw materials in parts by weight: 30-65 partsof aluminum sulfate, 2-8 parts of an organic amine, 1-3% of a stabilizer, 1-5 parts of a suspending agent, 20-35 parts of water, 2-5 parts of bentonite and 4-6% of magnesium fluosilicate. In the present invention, the caulking agent for building decoration of prefabricated parts is simple in preparation method, low in cost, is liquid after preparation, can be uniformly mixed with concrete conveniently, contains no alkali or chlorine or pungent smell, is high in safety, is harmless to human body, is excellent in cohesiveness; adding of a stabilizing agent can prolong the storage time, preventdeterioration; magnesium fluosilicate and aluminum sulfate are adopted for cooperative using, so that the resilience value is low, later strength retention rate is high, and impermeability grade is high; adding of the alkali-free concrete accelerator in sprayed concrete is capable of achieving a preferable working environment and considerable market value.

The invention provides a molded siliceous hydrated alumina, and a preparation method and an application thereof. The molded siliceous hydrated alumina is prepared through using raw materials containing at least one hydrated alumina, at least one siliceous compound and at least one cellulose ether, and has a water absorption of 0.4-1.5, a radial crushing strength of above 12N/mm and a strength loss rate after immersion in water of below 10%. The invention also provides a molded siliceous alumina. The molded siliceous alumina is prepared through roasting the molded siliceous hydrated alumina. The invention further provides an application of the molded siliceous hydrated alumina and the molded siliceous alumina as a dryer or a carrier of a supported catalyst. The above molded materials have good strength retention rates and absorption properties, and catalysts prepared by using the molded materials as the carrier have high catalysis properties. No peptizing agents are used in the preparation method.

The invention provides an iron-containing hydrated alumina molded matter, and a preparation method and an application thereof. The iron-containing hydrated alumina molded matter is prepared from raw materials comprising at least one hydrated alumina, at least one iron-containing compound and at least one cellulose ether. The water absorption rate of the iron-containing hydrated alumina molded matter is 0.4-1.5, the delta value is 10% or less, and the Q1 is 12 N/mm or more. The invention also provides an iron-containing alumina molded matter prepared by calcination of the iron-containing hydrated alumina molded matter. The invention also provides an application of the molded matters as a drying agent or as a carrier of a supported catalyst. The iron-containing hydrated alumina molded matter contains no peptizing agent, has good strength retention rate, and cannot or basically cannot generate phenomena of dissolving, powdering or pore collapsing even being immersed in an impregnating solution for a long time. The method of the invention does not adopt the peptizing agent.

The object of the present invention is to provide an alkali-dispersible hot melt pressure-sensitive adhesive which (i) has a high alkali-dispersibility, (ii) is excellent in strength to retain a label, (iii) hardly causes an adhesive residue problem and (iv) is capable of reducing stringing. The present invention relates to an alkali-dispersible hot melt pressure-sensitive adhesive comprising: (A) a thermoplastic block copolymer which is a copolymer of a vinyl-based aromatic hydrocarbon and a conjugated diene compound, (B) a tackifier resin and (C) at least one selected from the group consisting of a fatty acid and a derivative thereof, wherein the component (C) comprises (C1) a fatty acid derivative having a melting point of 40° C. or more.

The invention relates to a macromolecular material additive with an electromagnetic shielding function and a preparation method thereof. The preparation method comprises the following steps of (1) preparing a mixed filler; (2) soaking graphene by hydrochloric acid of 10% mass fraction for 1 to 2 h, and respectively cleaning by acetone and anhydrous ethanol; (3) mixing the treated graphene and themixed filler obtained in step (1) according to a weight ratio of (5 to 6):1; (4) mixing the product obtained in step (3) and nanocopper powder, stirring under the protection of inert gas, treating for30 to 40 min by ultrasonic waves, and baking for 1 to 2 h at the temperature of 100 to 120 DEG C, so as to obtain the additive. The macromolecular material additive with the electromagnetic shieldingfunction has the advantages that the electromagnetic shielding effect is good; the macromolecular material additive can be added into multiple types of macromolecular materials, so that the application range of the additive is increased; by mixing the graphene and the nanocopper powder, the electromagnetic shielding effect is effectively improved.

The invention specifically relates to a manufacturing method for a high-wear-resistance polyethylene fishing net, belonging to the technical field of manufacturing of fishing gear materials. The manufacturing method comprises the following steps: preparation of auxiliary agents; batching; granulation; wire drawing; and shaping. Compared with the prior art, the invention has the following advantages: through addition of the auxiliary agents and reasonable control of conditions in each step, amorphous parts in netting twines are obviously oriented, shish-kebab and fibrous structures are formed in a sample, and the degree of crystallization reaches 65.84%, 63.5% higher than the crystallization degree of polyethylene filaments; and due to changes of conditions like water cooling, the manufacturing cost of the fishing net is increased by about 1200 yuan/ton, but the prepared polyethylene fishing net overcomes the disadvantage of softening and adhesion fatigue of polyethylene filament materials caused by the action of frictional heat, has resistance to frictional heat and wear resistance stability, presents good strength retention ratio under the condition of dry friction or water lubrication and is improved in the usage performance of fishing net threads.